Ok starting a new thread of my own.
2009 LT XFE California Car, 130k.
Car previously would run for a short period of time then wouldnt start, no fuel pressure at the rail (February, literally died when I was out buying a Valentines gift for my wife, not a good day).
I changed the fuel pump and filter and reservoir pump last Thursday (NU6 California Car).
Now when I try and start it I get a P0230 Fuel Pump Primary Circuit and no start no fuel pressure after changing the pump etc. I replaced the relay and swapped the fuse (which was fine but did it anyways) double checked it was in the correct slot. I visually inspected the ground on the engine (G105 I think it's called, saw this in several other posts), no corrosion just some light road dust/dirt, etc nothing that would cause me to think it was a problem. It did for a short while, build fuel pressure and try and start and then almost immediately die then suddenly stopped doing that. I also cannot hear the pump running when the key is turned now. I replaced the battery (old one was toast). No change in condition.
The wiring connector on the pump did get a little melted near the tip where the pump was melted but the terminals inside the connector looked undamaged so we re-used it. I'm going to check tonight to make sure the ignition is getting power to rule out theft deterrent system (saw in another post).
I'm suspecting a bad PCM but not sure how to test for that. I'm really banging my head against the wall on this one.